<template>
  <div>
    <div class="search">
      <input v-model="keyword" type="text" placeholder="输入城市名或拼音" class="search-input">
    </div>
    <div
      class="search-content"
      ref="search"
      v-show="keyword"
    >
      <ul>
        <li class="search-item border-bottom"
            v-for="item of list"
            @click="handleCityClick(item.name)"
        >
          {{item.name}}
        </li>
        <li class="search-item border-bottom" v-show="hasNoData">没有找到匹配数据</li>
      </ul>
    </div>
  </div>
</template>

<script>
    import Bscroll from 'better-scroll'
    import {mapMutations} from 'vuex'
    export default {
      name: "CitySearch",
      props:{
        cities:Object
      },
      data (){
        return {
          keyword:'',
          list:[],
          timer:null
        }
      },
      methods:{
        handleCityClick(city){
          //需要修改公用数据时，要调用dispatch方法，触发action,把changeCity函数在action中执行
          // this.$store.commit('changeCity',city);
          this.changeCity(city);
          this.$router.push('/');
        },
        ...mapMutations(['changeCity'])
      },
      mounted(){
        this.scroll = new Bscroll(this.$refs.search);
      },
      computed:{
        hasNoData (){
          return !this.list.length;
        }
      },
      watch:{
        keyword(){
          //性能优化，节流
          if(this.timer){
            clearTimeout(this.timer);
          }
          if(!this.keyword){
            this.list = [];
            return;
          }
          this.timer = setTimeout(()=>{
            //声明一个空数组，装遍历后的数据
            const result = [];
            //遍历
            for(let i in this.cities){
              this.cities[i].forEach((value)=>{
                if(value.spell.indexOf(this.keyword) > -1 || value.name.indexOf > -1){
                  result.push(value);
                }
              })
            }
            this.list = result;
          },100)
        }
      }
    }
</script>

<style scoped lang="stylus">
  @import '~styles/varibles.styl'
  .search
    height:.72rem
    padding:0 .1rem
    background: $bgColor
    position:relative
    z-index:9
    .search-input
      box-sizing:border-box
      width:100%
      height:.62rem
      padding:0 .1rem
      line-height:.62rem
      text-align:center
      border-radius:.06rem
      color:#666
  .search-content
    position:absolute
    top:1.58rem
    left:0
    right:0
    bottom:0
    background: #eee
    z-index:1
    .search-item
      line-height:.64rem
      padding-left:.2rem
      color:#666
      background: #fff

</style>
